CAS 439114-13-3 appears in our catalog under these names: Bis–PEG5–acid, HOOC-PEG(5)-COOH, Bis-PEG5-acid, >95.0%(GC)(T), TFP-dPEG®,12-Biotinidase Resistant Biotin, Bis-PEG5-acid 95%. Offered by: GLPBio, Iris Biotech, TCI, Biosynth, Ambeed. Available pack sizes: 1g, 250mg, 500mg, 5g, 100mg, 1000mg, 10g, 25g.